DISEASE CHARACTERISTICS: Histologically or cytologically confirmed non-small cell lung cancer (NSCLC) Stage IV OR Stage IIIB with malignant pleural or pericardial effusion At least 1 unidimensionally measurable lesion At least 10 mm by spiral CT scan OR At least 20 mm by standard techniques OR Evaluable, non-measurable disease (e.g., ascites, bone metastases, or malignant pleural or pericardial effusion) No CNS metastases other than lesions locally treated with surgery or radiosurgery, provided there was no evidence of CNS progression for at least 4 weeks after completion of treatment No prior or concurrent brain or other CNS metastases not amenable to local therapy (e.g., multiple brain lesions or meningeal involvement) Not a candidate for surgical treatment of NSCLC